#include <Arduino.h>
#include "TimerOne.h"
#include <EEPROM.h>

#define BAUD 9600

//TLC5940NT pin definitions
#define VPRG 2
#define SIN 11
#define SCLK 13
#define XLAT 4
#define BLANK 5
#define DCPRG 6
#define GSCLK 7

#define id 0
#define first_flash true

// start reading from the first byte (address 0) of the EEPROM
int  address = 300;
int  vuelta = 0;

#define  intensidad 252 //0 - 255

const byte remap[7][5] = { //Mapeo de los leds
  {0,7,18,25,36},
  {1,8,19,26,37},
  {2,9,20,27,38},
  {3,10,21,32,39},
  {4,11,22,33,40},
  {5,16,23,34,41},
  {6,17,24,35,42},  
};
               
int modo= 0;
                        
byte numero[10][7] =  { { B01110, B10001, B10011, B10101, B11001, B10001, B01110}, //48 = '0'
                        { B00100, B01100, B10100, B00100, B00100, B00100, B11111}, //49 = '1'
                        { B01110, B10001, B00001, B00110, B01000, B10000, B11111}, //50 = '2'
                        { B01110, B10001, B00001, B01110, B00001, B10001, B01110}, //51 = '3'
                        { B00010, B00110, B01010, B10010, B11111, B00010, B00010}, //52 = '4'
                        { B11111, B10000, B11110, B00001, B00001, B10001, B01110}, //53 = '5'
                        { B01110, B10001, B10000, B11110, B10001, B10001, B01110}, //54 = '6'
                        { B11111, B00001, B00010, B00100, B01000, B10000, B10000}, //55 = '7'
                        { B01110, B10001, B10001, B01110, B10001, B10001, B01110}, //56 = '8'
                        { B01110, B10001, B10001, B01111, B00001, B10001, B01110}, //57 = '9'
};

byte caracterA[13][7] =  {{ B01110, B10001, B10001, B11111, B10001, B10001, B10001}, //65 = 'A'
                         { B11110, B10001, B10001, B11110, B10001, B10001, B11110}, //66 = 'B'
                         { B01110, B10001, B10000, B10000, B10000, B10001, B01110}, //67 = 'C'
                         { B11110, B10001, B10001, B10001, B10001, B10001, B11110}, //68 = 'D'
                         { B11111, B10000, B10000, B11110, B10000, B10000, B11111}, //69 = 'E'
                         { B11111, B10000, B10000, B11110, B10000, B10000, B10000}, //70 = 'F'
                         { B01110, B10001, B10000, B10111, B10001, B10001, B01110}, //71 = 'G'
                         { B10001, B10001, B10001, B11111, B10001, B10001, B10001}, //72 = 'H'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B11111}, //73 = 'I'
                         { B00001, B00001, B00001, B00001, B10001, B10001, B01110}, //74 = 'J'
                         { B10001, B10010, B10100, B11000, B10100, B10010, B10001}, //75 = 'K'
                         { B10000, B10000, B10000, B10000, B10000, B10000, B11111}, //76 = 'L'
                         { B10001, B11011, B10101, B10001, B10001, B10001, B10001}, //77 = 'M'
};
                         
byte caracterB[14][7] = {{ B10001, B11001, B10101, B10011, B10001, B10001, B10001}, //78 = 'N'
                         { B01110, B10001, B10001, B10001, B10001, B10001, B01110}, //79 = 'O'
                         { B11110, B10001, B10001, B11110, B10000, B10000, B10000}, //80 = 'P'
                         { B01110, B10001, B10001, B10001, B10101, B10101, B01110}, //81 = 'Q'
                         { B11110, B10001, B10001, B11110, B10100, B10010, B10001}, //82 = 'R'
                         { B01110, B10001, B10000, B01110, B00001, B10001, B01110}, //83 = 'S'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B00100}, //84 = 'T'
                         { B10001, B10001, B10001, B10001, B10001, B10001, B01110}, //85 = 'U'
                         { B10001, B10001, B10001, B10001, B10001, B01010, B00100}, //86 = 'V'
                         { B10001, B10001, B10001, B10001, B10101, B10101, B01010}, //87 = 'W'
                         { B10001, B10001, B01010, B00100, B01010, B10001, B10001}, //88 = 'X'
                         { B10001, B10001, B01010, B00100, B00100, B00100, B00100}, //89 = 'Y'
                         { B11111, B00001, B00010, B00100, B01000, B10000, B11111}, //90 = 'Z'
                         { B10000, B10000, B10000, B10010, B01010, B00110, B11110}, //flecha = 35
};

byte espacio[7] = { B00000, B00000, B00000, B00000, B00000, B00000, B00000}; //32 = ' '

//byte sonrisa[7] = { B00000, B01010, B01010, B00000, B10001, B01110, B00000}; //Sonrisa

byte test[7] = { B11111, B11111, B11111, B11111, B11111, B11111, B11111};//0x01
byte test1[7] = { B11111, B11111, B11111, B11111, B11111, B11111, B11111};//0x01

// Holds the current colour level for each of the buttons
int levelW[64] = {
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

// Variables for interpreting the serial commands

byte command[64] = {
   ' ', ' ', 'B', 'E', 'N', 'V', 'I', 'N', 'G', 'U', 'D', 'E', 'S', ' ', ' ', ' ',
   ' ', 'B', 'E', 'N', 'V', 'I', 'N', 'G', 'U', 'T', 'S', ' ', 'A', 'L', ' ', ' ',
   ' ', ' ', 'C', 'I', 'B', 'E', 'R', 'N', 'A', 'R', 'I', 'U', 'M', ' ', ' ', ' ',
   ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' '};

byte finish = 1;

byte count = 0x00;
boolean save=false;
boolean sincro=false;
boolean bloqueo=false;
boolean update = false;

unsigned long time=0;

// Transfer a character out over hardware SPI
char spi_transfer(volatile byte data)
{
  SPDR = data;                    // Start the transmission
  while (!(SPSR & (1<<SPIF)))     // Wait the end of the transmission
  {
  };
  return SPDR;                    // return the received byte
}

void timerIsr(){
      sei(); //Reenable global interrupts, otherwise serial commands will get dropped
      if(Serial.available()){
          byte val = Serial.read();
          if ((val=='\r')||(val=='\n')) 
          {
            if(val=='\r') 
            {
              Serial.write(val);
              count = 0x00;
              vuelta = 0x00;
              command[0] = ' ';
              bloqueo = false;
              save = true;
            }
          }
          #if id == 0
          else if ((val==' ')||((val<='9')&&(val>='0'))||((val<'N')&&(val>='A'))||((val<='Z')&&(val>='N'))||((val<'n')&&(val>='a'))||((val<='z')&&(val>='n')))
            {
              command[count] = val;
              count++;
              bloqueo = false;
              save = true;   
              update = true;
            }
          #else
          else if (val== (id + 0x0F)) sincro = true;
          else if (sincro) {command[0] = val; bloqueo = false; sincro = false;}
          else Serial.write(val);
          #endif
      }
    // If the serial buffer is getting too close to full, keep executing the parsing until it falls below a given level
    // This might cause flicker, or even dropped messages, but it should prevent a crash.
}

void setup() {
  
  
  // Start the serial port
  Serial.begin(BAUD);
  delay(10);
  
  //Setup data directions, and set everything to the correct initial levels,
  // For TLC5940
  pinMode(VPRG, OUTPUT);
  pinMode(SIN, OUTPUT);
  pinMode(SCLK, OUTPUT);
  pinMode(XLAT, OUTPUT);
  pinMode(BLANK, OUTPUT);
  pinMode(DCPRG, OUTPUT);
  pinMode(GSCLK, OUTPUT);
  pinMode(MISO, INPUT);
  pinMode(SS,OUTPUT);
  digitalWrite(SS,HIGH); //disable device
  digitalWrite(SIN, LOW);
  digitalWrite(SCLK, LOW);
  digitalWrite(XLAT, LOW);
  digitalWrite(VPRG, LOW);
  digitalWrite(BLANK, HIGH);
  digitalWrite(GSCLK, HIGH);
  digitalWrite(DCPRG, LOW); // USE EEPROM DC register if LOW
  
  //////// LECTURA DE EEPROM ////////
 #if id == 0 
    delay(100); 
    #if first_flash
      EEPROM.write(address, 48);
      for (int i = 0; i<48; i++) EEPROM.write(address + 1 + i, command[i]); // grabamos en eeprom el caracter
    #endif
    
    count = EEPROM.read(address);
    if (count>63) count = 63;
    for(int i = 0; i<count; i++) command[i] = EEPROM.read(address + 1 + i);
 #endif
            
  
  //Setup the Hardware SPI registers
  // SPCR = 01010000
  //interrupt disabled,spi enabled,msb 1st,master,clk low when idle,
  //sample on leading edge of clk,system clock/4 (fastest)
  byte clr;
  SPCR = (1<<SPE)|(1<<MSTR);
  clr=SPSR;
  clr=SPDR;
  delay(10);
  
  Timer1.initialize(500); // set a timer of length 1000000 microseconds (or 1 sec - or 1Hz)
  Timer1.attachInterrupt( timerIsr ); // attach the service routine here  
  
  delay(10);
  
  time=millis();
  
}

#if id == 0
  int limit = 16;
#else
  int limit = 0;
#endif

void loop () {
 
  //letra(caracterA[2], espacio);
  //Serial.println(caracterA[2][1], BIN);
  //for (int i =0; i<100; i++) makemagic();
  makemagic();
#if id == 0
  if (save)
    {
      Timer1.stop(); // set a timer of length 1000000 microseconds (or 1 sec - or 1Hz)
      //Serial.println(count);
      EEPROM.write(address, count);
      for (int i = 0; i<count; i++) EEPROM.write(address + 1 + i, command[i]); // grabamos en eeprom el caracter
      save = false;
      Timer1.initialize(500); // set a timer of length 1000000 microseconds (or 1 sec - or 1Hz)
    }  
  if (((millis()-time)>=5000)||(update))
  {
    update = false;
    //for (int i = 1; i<count; i++) Serial.write(command[i]);  
    bloqueo = false;
    for (int i = 1; i<limit; i++) 
      {
        Serial.write(0x0F + i);
        if (((vuelta*limit) + i) >= count) Serial.write(' ');
        else Serial.write(command[(vuelta*limit) + i]);
      }
             // Serial.println();

  }
#endif        
//letra(test1,test1);
    if (!bloqueo)
    {
      time=millis();
      if (command[limit*vuelta]==32) modo=1; //Espacio
      else if ((command[limit*vuelta]<='9')&&(command[limit*vuelta]>='0')) modo=2; //Numeros
      else if ((command[limit*vuelta]<'N')&&(command[limit*vuelta]>='A')) modo=3; //Letras de la 'A' a la 'M'
      else if ((command[limit*vuelta]<='Z')&&(command[limit*vuelta]>='N')) modo=5; //Letras de la 'N' a la 'Z' y la flecha
      else if ((command[limit*vuelta]<'n')&&(command[limit*vuelta]>='a')) modo=4; //Letras de la 'a' a 'm'
      else if ((command[limit*vuelta]<='z')&&(command[limit*vuelta]>='n')) modo=6; //Letras de la 'n' a la 'z'
      //else modo=7;   
      switch (modo) {
        case 1: if (finish) {letra(espacio,espacio); modo=0;} break;
        case 2: if (finish) {letra(numero[command[limit*vuelta] - '0'],espacio); modo=0;} break;
        case 3: if (finish) {letra(caracterA[command[limit*vuelta] - 'A'],espacio); modo=0;} break;
        case 4: if (finish) {letra(caracterA[command[limit*vuelta] - 'a'],espacio); modo=0;} break;
        case 5: if (finish) {letra(caracterB[command[limit*vuelta] - 'N'],espacio); modo=0;} break;
        case 6: if (finish) {letra(caracterB[command[limit*vuelta] - 'n'],espacio); modo=0;} break;
        //case 7: if (finish) {letra(sonrisa,espacio); modo=0;} break;
        case 8: letra(espacio,espacio); if (modo==8) modo=0; finish=1; break; 
        case 9: letra(test,espacio); if (modo==9) modo=0; finish=1; break; 
      }
      bloqueo = true;
      int n = 0;
      if (count > 3*limit) n = 3;
      else if (count > 2*limit) n = 2;
      else if (count > limit) n = 1;
      else n = 0;
      if (vuelta < n) vuelta++;
      else vuelta = 0;
    }
}


void makemagic(){
  setGreysW1();        
  feedPorts();
  setGreysW2();        
  feedPorts();
}

void setGreysW1() {
  digitalWrite(BLANK, HIGH);
  digitalWrite(XLAT,LOW);
  for(int i = 21; i>=0; i--){
    spi_transfer(0x00);
    spi_transfer( (0x00) | ((levelW[2*i] & 0x0F00) >> 8) );
    spi_transfer( levelW[2*i] & 0xFF);
  }
  digitalWrite(XLAT,HIGH);
  digitalWrite(XLAT,LOW);
  digitalWrite(BLANK, LOW);
}

void setGreysW2() {
  digitalWrite(BLANK, HIGH);
  digitalWrite(XLAT,LOW);
  for(int i = 21; i>=0; i--){
    spi_transfer( (levelW[2*i+1] & 0x0FF0) >> 4 );
    spi_transfer( ((levelW[2*i+1] & 0xF) << 4) | (0x00) );
    spi_transfer(0x00);
  }
  digitalWrite(XLAT,HIGH);
  digitalWrite(XLAT,LOW);
  digitalWrite(BLANK, LOW);
}

void feedPorts() {
  // Clock for TLC5940's PWM
  digitalWrite(BLANK, HIGH);
  digitalWrite(BLANK, LOW);      //=all outputs ON, start PWM cycle
  for (int i=0; i<4096; i++) {
    pulseGSCLK();
  }
}

void pulseGSCLK() {
  //ultra fast pulse trick, using digitalWrite caused flickering
  PORTD |= 0x80 ; // bring pin 7 high, but don't touch any of the other pins in PORTB
  //16 nanosecs is the min pulse width for the 5940, but no pause seems needed here
  PORTD &= 0x7F;  // bring pin 7 low without touching the other pins in PORTB
}

byte letra(byte let[7], byte let_ant[7]) {
  byte letbool=0;
  byte let_new[7] = { B00000, B00000, B00000, B00000, B00000, B00000, B00000};
  
  for(byte j = 1; j <6; ++j){
    for(byte h = 0; h <7; ++h){ 
      let_new[h]=((0X1F&(let_ant[h]<<j))|(let[h]>>(5-j)));
    }
    letbool=0;
      for(byte x = 0; x < 7; ++x){ //Actualizacion de los leds 
         for(byte y = 0; y <5; ++y){
             if (0x01&let_new[letbool]>>y) levelW[remap[x][y]] = 16*intensidad;
             else levelW[remap[x][y]] = 0;
             }
           //Serial.println(let_new[letbool], BIN);
           ++letbool;
         }
    for(int i = 0; i <20; ++i) makemagic();
  }
}

byte letraWrite(byte let[7]) {
  byte letbool=0;
    letbool=0;
      for(byte x = 0; x < 7; ++x){ //Actualizacion de los leds 
         for(byte y = 0; y <5; ++y){
             if (0x01&let[letbool]>>y) levelW[remap[x][y]] = 16*intensidad;
             else levelW[remap[x][y]] = 0;
             }
           ++letbool;
         }
    for(int i = 0; i <20; ++i) makemagic();
}